JP6721953B2 - Water turbine duct - Google Patents

Description

The present invention relates to a water guide duct for a water turbine, which can efficiently use a water flow in a water channel.

The technique of disposing the water turbine in the duct is disclosed in Patent Document 1, for example.

JP-A-2000-9012

In the power generation device described in Patent Document 1, a large number of power generators are arranged in a long duct having a constant pipe diameter. If such a duct is installed in, for example, a water channel, the generator becomes a resistance, and the flowing water passing through the inside of the duct becomes a flowing water at a lower speed than the flowing water on the outside, so that the power generation efficiency decreases.
It is an object of the present invention to provide a water guide duct for a water turbine (hereinafter simply referred to as a duct) which is arranged so as to block an irrigation canal with a duct and can utilize a high water pressure.

The specific contents of the present invention are as follows.

(1) A square tubular shape in a front view, which is a rectangular tube that is buried in the waterway so as to block the irrigation canal. a spherical over a part to the highest part of the rear of the front slope that follows, the height of and best part of the highest portion as closer before the front and rear intermediate duct with higher than the vertical length of the rotor, the over from the highest part to the rear end of the duct and arc curved descending gradually, the maximum portion and forming a narrow path between the upper inner wall surface of the duct in its upper side, than the highest portion of the rear of the Maesaka of該隘path A water duct for a water turbine that arranges the turbine casing so that the front of the propeller-type lift-type blade of the rotor faces the upstream direction at a high position.

(2) A front end surface of the duct in a side view is formed as an inclined surface from the upper surface to the lower surface so that the lower end comes out in front of the upper surface, and the front lower end of the front lower portion on the bottom surface of the duct is Yes together with the front end surface, the bottom layer flow of the canal when buried in the water channel of canals, the front plate of the bottom surface of the duct and the spherical shape, arc descending gradually over the rear end of the duct through the highest portion (1) The water duct for a water turbine, which allows a curved surface to pass through at high speed by the Coanda effect.

(3) on the outer surface of the left and right side wall plates of the duct, over a period from the outside to the inside, and to form a cut over the lower F from the upper surface, the該切inclusive, the canal in plan view the wall and the side wall of the duct The outer end of a plate-shaped water blocking material for blocking between the plate and the wall is in contact with the wall surface of the irrigation channel, and the base end of the water blocking material is removably fitted in the cut in the side wall plate of the duct (1. ) Or (2) Water turbine duct.

(4) the duct is formed of FRP, the bottom front of the water conduit which penetrates back and forth, in the central vertical sectional side, spherical leading edge from the front lower portion subjected to continued from previous slope then the best part of its rear and then, the best part of the closer before the front and rear intermediate duct, the height of the highest-section as to set higher than the vertical length of the rotor, descends gradually over the highest-portion to the rear end of the duct The water guide duct for a water turbine according to any one of the above (1) to (3), which has an arcuate curved surface, and a lower part of a bottom surface of the water guide path is hollow so that water can be injected.

According to the present invention, the following effects can be obtained.

In the invention described in (1) above, since the bottom surface of the water conduit that penetrates in the front and rear is a longitudinal side view, the front edge is spherical, and the curved surface gradually descends from the highest part to the rear end. As for the water flow entering this headrace, the bottom layer flow rubs up the leading edge, increasing the speed from the highest part, while descending at a high speed on the gently curved arc curved slope in the rear part.
Since the highest part of the bottom of the headrace corresponds to the bottleneck, disposing a water turbine here will enable efficient high-speed rotation and power generation.

In the invention described in (2) above, the bottom part of the duct projects forward rather than the top part in a side view of the duct, so that the bottom surface of the headrace channel projects forward to guide the bottom laminar flow of the irrigation channel under water pressure. Easy to lead to the front end of the waterway.

In the invention described in (3) above, the water blocking material is attached to the outer surface of the duct in plan view, so that even if there is a gap between the sidewall surface of the water channel and the outer surface of the duct, The material can close the gap between the outer side surface of the duct and the side wall surface of the water channel to facilitate the entry of the water flow into the duct at a high water pressure.

In the invention described in (4) above, the duct is formed of FRP, and the inside of the bottom of the water conduit is hollow so that water can be poured. Therefore, by pouring water into the hollow body, the duct should be submerged in the irrigation canal. Can be done.

It is a vertical side view of the water guide duct of the water turbine of the present invention. 1 is a front view of a water duct of the water turbine of the present invention. It is a top view of the water duct of this invention turbine.

The present invention will be described below with reference to the drawings.
In FIG. 1, a water guide duct 1 (hereinafter simply referred to as a duct) of a water turbine is formed in a substantially trapezoidal shape in a side view.

A water conduit 4 that penetrates from the front surface 2 to the rear surface 3 of the duct 1 is formed, and its upper inner wall surface 4A is located above, and its front and rear central portions are formed into an arc curved surface projecting downward. Further, the front and rear ends of the bottom surface 4B are lower so as to contact the bottom surface r of the water channel, and the front edge in the longitudinal side view is spherical and has a downwardly curved curved surface from the highest portion 4C to the rear end.

The front surface 2 obliquely projects forward from the upper portion to the lower surface. As a result, the front lower portion 4D of the bottom surface 4B of the water conduit 4 can be projected forward, and the bottom laminar flow can be efficiently guided from the bottom surface r of the water channel to the innermost portion 4C.

Since the bottom surface 4B of the water conduit 4 has a larger swelling than the cross section of the lifting blade, the water flow passing along this bottom surface 4B passes at high speed due to the Coanda effect. Further, since it is a bottleneck in the highest portion 4C, the flow velocity in this portion becomes the fastest.
Therefore, by disposing the rotor 6 of the water turbine 5 at the highest portion 4C, efficient power generation can be achieved.

In the water turbine 5, the rotor 6 is attached to the tip of a rotor shaft 6A supported inside the water turbine housing 5A, and the lift type blade 7 of the rotor 6 has an inclined portion 7A whose tip is inclined forward. There is.

The turbine casing 5A is supported by a suspending body 8 which penetrates through the duct 1 and projects upward, and the upper end of the suspending body 8 is connected to a generator 10 fixed to a suspension girder 9. A transmission shaft (not shown) connected to the rotor shaft 6A is provided inside the suspension body 8. The transmission shaft is connected to the main shaft of the generator 10, and the generator 6 generates electricity by the rotation of the rotor 6.

In order to prevent the duct 1 from flowing and moving, the fixing girders 12 suppress the upper surface of the duct 1 from the support girders 11 installed on both banks of the water channel R. The fixing means 12 may be any known one, but in FIG. 1, a hand-threaded screw rod is shown.
Inside the bottom surface 4B of the duct 1, a weight 13 is detachably attached as needed.

As shown in FIG. 3, if necessary, cuts 14, 14 are formed on both sides of the duct 1 so as to penetrate deeply from the diagonally front outer side to the rear inner side and penetrate from the upper side to the lower side. Fit 15 and 15. The length of the water blocking material 15 is appropriately adjusted according to the gap between the side wall of the water channel R and the outside of the duct 1.

As a result, the duct 1 acts as a weir of the irrigation canal R, the dammed running water flows down over the upper surface of the duct 1, and the water under pressure enters the water conduit 4 of the duct 1 at high speed. It passes and rotates the water turbine 5 efficiently.

If necessary, the dust remover 16 shown in FIG. 1 can be attached to the front surface 2 of the duct 1. The dust remover 16 has a vertical striped lattice shape, a cage shape, or any other suitable object, and the lower end of the dust remover 16 is slanted forward so that the dust that comes into contact therewith rises upward and passes through the upper surface of the duct 1.

Although the material of the duct 1 is arbitrary, for example, the core is made of foamed resin and the surface thereof is the surface layer of the FRP. As a result, even a duct having a certain size can be easily molded, and since it is lightweight, it can be easily transported and installed. As a matter of course, the hollow body is made of FRP, and the hollow portion is filled with water to be deposited in the water channel R.

As a manufacturing method, the duct 1 shown in FIG. 1 is formed into two parts, which are vertically divided, and the water turbine 5 can be attached to the upper member. Then, the upper and lower members are overlapped and joined.
Alternatively, a square tube is formed of FRP or metal, and an inner member formed of foamed resin is attached to the inner surface thereof.

At the time of installation, the water source of the water channel R is closed and the duct 1 is fixed to the bottom surface r of the channel. The length of the suspension 8 is adjusted, and the power transmission inside is connected to the generator 10 supported by the suspension girder 9.

When the water flows through the irrigation canal R, the bottom laminar flow reaches the highest part 4C from the front lower part 4D of the duct 1 by climbing the front slope 4E of the water conduit 4, and merges with the upper laminar flow to become high speed by the Coanda effect to the rear. After passing, the rotor 6 of the water turbine 5 is efficiently rotated in the process.

Further, also in the upper inner wall surface 4A of the water conduit 4, the front and rear central portions bulge downward, so that the water flow passes at high speed in this central portion due to the Coanda effect.
The high-speed water flow that hits the lift-type blade 7 of the rotor 6 moves in the centrifugal direction, diffusion is suppressed by the inclined portion 7A, and the rotation efficiency is increased.

This duct 1 not only collects and passes the water flow, but also has a vertical cross section of the bottom surface 4B of the water conduit 4, which is an arc curved surface with a high middle. Therefore, due to the Coanda effect, the water pressure on the bottom surface 4B of the duct 1 is increased. It is characterized in that the underlying laminar flow passes at high speed.

Further, when the duct 1 is arranged so as to block the irrigation canal R, an action of blocking the water flow is generated in the duct 1 and water pressure is applied to the duct 1, so that the Coanda effect generated in the water conduit 4 rotates the rotor 6 efficiently. Let

It should be noted that the waterproofing material 15 in FIG. 3 is made to be a hard material, and for example, a U-shaped frame body (not shown) is attached to the side wall of the irrigation channel R, and the tip portion of the waterproofing material 15 is fitted into the groove portion. It is possible to fix the duct 1 and serve as a dam plate.

According to the present invention, the bottleneck in the duct and the Coanda effect are combined to generate a high-speed flow in the water conduit. Therefore, the present invention can be used for hydraulic power generation in a canal with a slow flow velocity, and a high effect can be obtained.

1. Water turbine duct 2. Front 3. Rear surface 4. Headrace 4A. Upper inner wall surface 4B. Bottom 4C. Highest part 4D. Lower front 4E. Maezaka
4F. Side wall plate 5. Water wheel 5A. Turbine housing 6. Rotor 6A. Rotor shaft 7. Lifting blade 7A. Inclined part 8. Hanging body 9. Suspension girder
10. Generator
11. Support girder
12. Fixing means
13. Weight
14. Notch
15. Water stop material
16. Dust removal R. Irrigation channel r. Waterway bottom

Claims (4)

In the corner a tubular front view square, so as to close the canal, a long duct before and after embedded in waterways, the bottom front portion of the water conduit that penetrates back and forth, in the central vertical side, in it the front edge from the front lower portion over subsequent to the highest part of the rear of the front slope and a spherical shape, the height of and best part of the highest portion as closer before the front and rear intermediate duct with higher than the vertical length of the rotor, from the highest-portion over the rear end of the duct and arc curved descending gradually, in a position to form a narrow path, higher than the highest portion of the rear of the Maesaka of該隘path between the highest portion and the upper inner wall surface of the duct in its upper side A water duct for a water turbine, wherein the turbine casing is arranged so that the front surface of the propeller-type lift-type blade of the rotor faces the upstream direction. A front end surface in a side view of the duct is formed on an inclined surface so that a lower end thereof comes out from an upper surface from an upper surface to a lower surface, and a front lower end of a lower front portion of a bottom surface of the duct is a front end surface of the duct. Yes combined, the bottom layer flow of the canal when buried in the water channel of canals, the front plate of the bottom surface of the duct and the spherical shape, through the highest part of the arc curved surface descends gradually over the rear end of the duct, The water guide duct for the water turbine according to claim 1, wherein the water duct is configured to be passed at a high speed by the Coanda effect. The outer surface of the side wall plates of the right and left of the duct, over a period from the outside to the inside, and to form a cut over the lower F from the upper surface, the該切inclusive, the canal in plan view the wall and the side wall plate of the duct during the contact with the wall of the canal to the outer end portion of the plate-shaped water stopping material dam, characterized by removably fitted to Rukoto in cut the proximal end of該止waterstops in side walls of the duct The water duct of the water turbine according to claim 1. Said duct is formed of FRP, the bottom front of the water conduit which penetrates back and forth, in the central vertical side, and a spherical shape of the leading edge from the front lower portion subjected to continued from previous slope then the best part of its rear, the up portion and closer before the front and rear intermediate duct, the height of the highest-section and sets the high rather than the vertical length of the rotor, the arc curved surface descends gradually over the highest-portion to the rear end of the duct 4. The water guide duct for a water turbine according to any one of claims 1 to 3, wherein the lower part of the bottom surface of the water guide path is hollow so that water can be injected.

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